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how many valve per zone

I'm having a pro repairing 4 zones that are not working. Possibly replacing the electric valves. My question is, there should be only one valve per zone, is this correct. Are there exception or reason to have more than one valve per zone. I only know the basic of sprinkler system as you can tell by my question.

Did they find and repair the valve or did they redo the entire system. Is this residential? If the system is residential on a water meter, then it sounds like you could have flown me out from houston and put me up in a hotel for the week and still saved a little bit of cash.

4 zones repair or replace for about 150.00 each. I don't know all of the details. This is off of the top of my head.

Thank you very much Todd. You just confirmed what I already figured. Glad I didn't agreed to the work yet. It's not an all out refurbishment of the zone. Just to get it working again replacing the valves. I just wanted to give him a fair professional deal and avoid being taken. I'm a president of a condo association. I would have given him $600-800 for the job but not $1800.

Thanks again.

This post has been edited 1 times, last edit by "qhn" (Apr 19th 2011, 7:58am)

One more question, I was told those little green round covers are usually valves. Seems like there are one every 8-10 feet along the buildings, yet the timer only have 11 zone. Why would that be if there should be only one valve per zone. I'm a little confused.